12399659 has 4 divisors (see below), whose sum is σ = 12799680. Its totient is φ = 11999640.

The previous prime is 12399649. The next prime is 12399677. The reversal of 12399659 is 95699321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95699321 = 659 ⋅145219.

It is a cyclic number.

It is not a de Polignac number, because 12399659 - 2⁴ = 12399643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12399649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199964 + ... + 200025.

It is an arithmetic number, because the mean of its divisors is an integer number (3199920).

Almost surely, 2^12399659 is an apocalyptic number.

12399659 is a deficient number, since it is larger than the sum of its proper divisors (400021).

12399659 is an equidigital number, since it uses as much as digits as its factorization.

12399659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400020.

The product of its digits is 131220, while the sum is 44.

The square root of 12399659 is about 3521.3149532525. The cubic root of 12399659 is about 231.4567837265.

The spelling of 12399659 in words is "twelve million, three hundred ninety-nine thousand, six hundred fifty-nine".